Can you describe an orgasm?

I've asked this question before but most of the answers I've gotten were, "When you have one you'll know", or "They're amazing" ... yes I know they're amazing, that's understood, but I just want to know if women orgasm the same?? And also I want to know for sure it's an orgasm if/when I have one. What if I have really good sex one day and say I have an orgasm just because it was amazing, but ended up not really having one? So how do you know when you're having an orgasm? What happens to you personally? What happens to your body? How do you feel afterwards? Describe in detail!